Colored boxes denote paralogous clusters of six or more genes by chromosome (from http://wolfe.gen.tce.ie/dup/human5.28). The cluster at position 25Mb to 45 Mb on chromosome 3 is shared with a cluster on chromosome 17 at 41 Mb to 46 Mb and includes the 3 nuclear receptors: thyroid hormone alpha (17) and beta (3), rev-erb alpha (17) and beta (3) and retinoic acid alpha (17) and beta (3). ( Chr 3 in the above image is linked to the Human Chr 3 annotation data deposited in Genboree. )